CVE-2026-40161

HIGH

Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL

Title source: cna
STIX 2.1

Description

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, the Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled serverURL when the user omits the token parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing serverURL to an attacker-controlled endpoint. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

References (3)

Core 3
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/tektoncd/pipeline/issues/9608
X_Refsource_Misc x_refsource_misc
https://github.com/tektoncd/pipeline/issues/9609

Scores

CVSS v3 7.7
EPSS 0.0026
EPSS Percentile 17.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-201
Status published
Products (12)
linuxfoundation/tekton_pipelines 1.0.0 - 1.10.0
tektoncd/pipeline 1.0.0 - 1.0.2Go
tektoncd/pipeline 1.10.0 - 1.11.1Go
tektoncd/pipeline 1.2.0 - 1.3.4Go
tektoncd/pipeline 1.4.0 - 1.6.2Go
tektoncd/pipeline 1.7.0 - 1.9.3Go
tektoncd/pipeline >= 1.0.0, < 1.0.2
tektoncd/pipeline >= 1.0.0, <= 1.10.0
tektoncd/pipeline >= 1.10.0, < 1.11.1
tektoncd/pipeline >= 1.2.0, < 1.3.4
... and 2 more
Published Apr 21, 2026
Tracked Since Apr 21, 2026